// Numbas version: finer_feedback_settings
{"name": "EL Q007 - Solid State Devices & Frequency Response", "extensions": [], "custom_part_types": [], "resources": [["question-resources/FoESElQ07_-_LDR__Photodiode.PNG", "/srv/numbas/media/question-resources/FoESElQ07_-_LDR__Photodiode.PNG"], ["question-resources/FoESElQ07_-_Transistor_Oscillator.PNG", "/srv/numbas/media/question-resources/FoESElQ07_-_Transistor_Oscillator.PNG"], ["question-resources/FoESElQ07_-_Varicap_Diode_FBfQdZc.PNG", "/srv/numbas/media/question-resources/FoESElQ07_-_Varicap_Diode_FBfQdZc.PNG"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "EL Q007 - Solid State Devices & Frequency Response", "tags": [], "metadata": {"description": "<p>Question Covering SSD &amp; frequency response</p>", "licence": "All rights reserved"}, "statement": "<h2 style=\"text-align: center;\">Solid State Devices &amp; Frequency Response</h2>", "advice": "<p>see spread sheet</p>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part a) Signal Waveforms</strong></p>\n<p>Name and state the operating principles of the two Optoelectric devices shown.&nbsp;</p>\n<p><img src=\"resources/question-resources/FoESElQ07_-_LDR__Photodiode.PNG\" width=\"281\" height=\"393\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p></p>\n<p>SPICE Circuit suitable for analysis <a href=\"https://www.tinkercad.com/things/aYkHEFjwfol-foes-light-detection-semiconductors\">FoES Q007a</a></p>\n<p><strong>[4 Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part b) Oscillating Transistor Circuit</strong></p>\n<p>The circuit shows an Astable Oscillator circuit utilising BJT for switching.&nbsp;</p>\n<p><img src=\"resources/question-resources/FoESElQ07_-_Transistor_Oscillator.PNG\" width=\"535\" height=\"474\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p></p>\n<p><strong>Circuit Varibles:</strong>&nbsp;</p>\n<p><strong>V<sub>CC</sub> = 9V,</strong> <strong>R<sub>1</sub>, R<sub>4</sub>={1}k</strong><strong>&Omega;, </strong><strong>R<sub>2</sub>, R<sub>3</sub>={470}</strong><strong>&Omega;, C<sub>1</sub>={150}uF</strong><strong>, </strong><strong>C</strong><strong><sub>2</sub></strong><strong>={100}uF.&nbsp; </strong></p>\n<ul>\n<li>Calculate or determine the frequency and Duty Cycle for V1<strong>.</strong></li>\n<li>How does the output change if C<sub>1</sub> is changed to {300}uF.</li>\n</ul>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://everycircuit.com/circuit/4963803225391104\">FoES Q007b</a></p>\n<p><strong>[6 Marks]</strong></p>\n<p></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part c) Varicap Frequency Response</strong></p>\n<p>The circuit shown has a DC and AC source, a resistor and a varicap diode for an electronic &nbsp;filter application.</p>\n<p style=\"text-align: center;\"></p>\n<p style=\"text-align: center;\"><img src=\"resources/question-resources/FoESElQ07_-_Varicap_Diode_FBfQdZc.PNG\" width=\"401\" height=\"448\"/></p>\n<p style=\"text-align: left;\"><strong>Circuit Varibles:&nbsp;</strong>V<sub>AC</sub> = {10}V<sub>(RMS) </sub>, R<sub>1</sub> = {1} k&Omega;<sub> </sub>D<sub>1</sub> = <a href=\"https://eu.mouser.com/datasheet/2/196/Infineon-BBY53SERIES-DS-v01_01-en-1225530.pdf\">BBY53-03W</a></p>\n<p>Using Calculation or Simulation, explain and evaluate the performance of the circuit in a frequency range from 100kHz to 100MHz for a value of V<sub>DC</sub> of 550mV, 650mV and 750mv.&nbsp; Ensure that you:</p>\n<ul>\n<li>Explain what is the operating principle that is being employed in this circuit.</li>\n<li>Identify the type of filter that the circuit is and the respective cut off frequencies.</li>\n<li>Using the cut-off frequencies determine the approximate capacitance of the Varicap Diode for the V<sub>DC</sub></li>\n</ul>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://www.multisim.com/content/KQCYmRFFSAC4yEtPQEruoM/variac/open/\">FoES Q007c</a></p>"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}]}]}], "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}]}